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1.1MyBatis简介
MyBatis 是一个可以自定义SQL、存储过程和高级映射的持久层框架。MyBatis 摒除了大部分的JDBC代码、手工设置参数和结果集重获。MyBatis 只使用简单的XML 和注解来配置和映射基本数据类型、Map 接口和POJO 到数据库记录。相对Hibernate和Apache OJB等“一站式”ORM解决方案而言,Mybatis 是一种“半自动化”的ORM实现。
需要使用的Jar包:mybatis-3.0.2.jar(mybatis核心包)。mybatis-spring-1.0.0.jar(与Spring结合包)。
下载地址:
http://ibatis.apache.org/tools/ibator
http://code.google.com/p/mybatis/
1.2MyBatis+Spring+MySql简单配置
1.2.1搭建Spring环境
1,建立maven的web项目;
2,加入Spring框架、配置文件;
3,在pom.xml中加入所需要的jar包(spring框架的、mybatis、mybatis-spring、junit等);
4,更改web.xml和spring的配置文件;
5,添加一个jsp页面和对应的Controller;
6,测试。
可参照:http://limingnihao.iteye.com/blog/830409。使用Eclipse的Maven构建SpringMVC项目
1.2.2建立MySql数据库
建立一个学生选课管理数据库。
表:学生表、班级表、教师表、课程表、学生选课表。
逻辑关系:每个学生有一个班级;每个班级对应一个班主任教师;每个教师只能当一个班的班主任;
使用下面的sql进行建数据库,先建立学生表,插入数据(2条以上)。
更多sql请下载项目源文件,在resource/sql中。(在一些情况下)
Sql代码:
- /* 建立数据库 */
- CREATE DATABASE STUDENT_MANAGER;
- USE STUDENT_MANAGER;
-
- /***** 建立student表 *****/
- CREATE TABLE STUDENT_TBL
- (
- STUDENT_ID VARCHAR(255) PRIMARY KEY,
- STUDENT_NAME VARCHAR(10) NOT NULL,
- STUDENT_SEX VARCHAR(10),
- STUDENT_BIRTHDAY DATE,
- CLASS_ID VARCHAR(255)
- );
-
- /*插入学生数据*/
- INSERT INTO STUDENT_TBL (STUDENT_ID,
- STUDENT_NAME,
- STUDENT_SEX,
- STUDENT_BIRTHDAY,
- CLASS_ID)
- VALUES (123456,
- ‘某某某‘,
- ‘女‘,
- ‘1980-08-01‘,
- 121546
- )
创建连接MySql使用的配置文件mysql.properties。
- jdbc.driverClassName=com.mysql.jdbc.Driver
- jdbc.url=jdbc:mysql://localhost:3306/student_manager?user=root&password=limingnihao&useUnicode=true&characterEncoding=UTF-8
1.2.3搭建MyBatis环境
顺序随便,现在的顺序是因为可以尽量的少的修改写好的文件。
1.2.3.1创建实体类: StudentEntity
- public class StudentEntity implements Serializable {
-
- private static final long serialVersionUID = 3096154202413606831L;
- private ClassEntity classEntity;
- private Date studentBirthday;
- private String studentID;
- private String studentName;
- private String studentSex;
-
- public ClassEntity getClassEntity() {
- return classEntity;
- }
-
- public Date getStudentBirthday() {
- return studentBirthday;
- }
-
- public String getStudentID() {
- return studentID;
- }
-
- public String getStudentName() {
- return studentName;
- }
-
- public String getStudentSex() {
- return studentSex;
- }
-
- public void setClassEntity(ClassEntity classEntity) {
- this.classEntity = classEntity;
- }
-
- public void setStudentBirthday(Date studentBirthday) {
- this.studentBirthday = studentBirthday;
- }
-
- public void setStudentID(String studentID) {
- this.studentID = studentID;
- }
-
- public void setStudentName(String studentName) {
- this.studentName = studentName;
- }
-
- public void setStudentSex(String studentSex) {
- this.studentSex = studentSex;
- }
- }
1.2.3.2创建数据访问接口
Student类对应的dao接口:StudentMapper。
- public interface StudentMapper {
-
- public StudentEntity getStudent(String studentID);
-
- public StudentEntity getStudentAndClass(String studentID);
-
- public List<StudentEntity> getStudentAll();
-
- public void insertStudent(StudentEntity entity);
-
- public void deleteStudent(StudentEntity entity);
-
- public void updateStudent(StudentEntity entity);
- }
1.2.3.3创建SQL映射语句文件
Student类的sql语句文件StudentMapper.xml
resultMap标签:表字段与属性的映射。
Select标签:查询sql。
- <?xml version="1.0" encoding="UTF-8" ?>
- <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
- <mapper namespace="com.manager.data.StudentMapper">
-
- <resultMap type="StudentEntity" id="studentResultMap">
- <id property="studentID" column="STUDENT_ID"/>
- <result property="studentName" column="STUDENT_NAME"/>
- <result property="studentSex" column="STUDENT_SEX"/>
- <result property="studentBirthday" column="STUDENT_BIRTHDAY"/>
- </resultMap>
-
-
- <select id="getStudent" parameterType="String" resultType="StudentEntity" resultMap="studentResultMap">
- <![CDATA[
- SELECT * from STUDENT_TBL ST
- WHERE ST.STUDENT_ID = #{studentID}
- ]]>
- </select>
-
-
- <select id="getStudentAll" resultType="com.manager.data.model.StudentEntity" resultMap="studentResultMap">
- <![CDATA[
- SELECT * from STUDENT_TBL
- ]]>
- </select>
-
- </mapper>
1.2.3.4创建MyBatis的mapper配置文件
在src/main/resource中创建MyBatis配置文件:mybatis-config.xml。
typeAliases标签:给类起一个别名。com.manager.data.model.StudentEntity类,可以使用StudentEntity代替。
Mappers标签:加载MyBatis中实体类的SQL映射语句文件。
- <?xml version="1.0" encoding="UTF-8" ?>
- <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
- <configuration>
- <typeAliases>
- <typeAlias alias="StudentEntity" type="com.manager.data.model.StudentEntity"/>
- </typeAliases>
- <mappers>
- <mapper resource="com/manager/data/maps/StudentMapper.xml" />
- </mappers>
- </configuration>
1.2.3.5修改Spring 的配置文件
主要是添加SqlSession的制作工厂类的bean:SqlSessionFactoryBean,(在mybatis.spring包中)。需要指定配置文件位置和dataSource。
和数据访问接口对应的实现bean。通过MapperFactoryBean创建出来。需要执行接口类全称和SqlSession工厂bean的引用。
- <context:property-placeholder location="classpath:mysql.properties" />
-
- <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
- <property name="driverClassName" value="${jdbc.driverClassName}" />
- <property name="url" value="${jdbc.url}" />
- </bean>
-
- <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
- <property name="dataSource" ref="dataSource" />
- </bean>
-
- <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
- <property name="configLocation" value="classpath:mybatis-config.xml" />
- <property name="dataSource" ref="dataSource" />
- </bean>
-
- <!— mapper bean -->
- <bean id="studentMapper" class="org.mybatis.spring.MapperFactoryBean">
- <property name="mapperInterface" value="com.manager.data.StudentMapper" />
- <property name="sqlSessionFactory" ref="sqlSessionFactory" />
- </bean>
也可以不定义mapper的bean,使用注解:
将StudentMapper加入注解
- @Repository
- @Transactional
- public interface StudentMapper {
- }
对应的需要在dispatcher-servlet.xml中加入扫描:
- <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
- <property name="annotationClass" value="org.springframework.stereotype.Repository"/>
- <property name="basePackage" value="com.liming.manager"/>
- <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
- </bean>
1.2.4测试StudentMapper
使用SpringMVC测试,创建一个TestController,配置tomcat,访问index.do页面进行测试:
- @Controller
- public class TestController {
-
- @Autowired
- private StudentMapper studentMapper;
-
- @RequestMapping(value = "index.do")
- public void indexPage() {
- StudentEntity entity = studentMapper.getStudent("10000013");
- System.out.println("name:" + entity.getStudentName());
- }
- }
使用Junit测试:
- 使用Junit测试:
- Java代码
- @RunWith(value = SpringJUnit4ClassRunner.class)
- @ContextConfiguration(value = "test-servlet.xml")
- public class StudentMapperTest {
-
- @Autowired
- private ClassMapper classMapper;
-
- @Autowired
- private StudentMapper studentMapper;
-
- @Transactional
- public void getStudentTest(){
- StudentEntity entity = studentMapper.getStudent("10000013");
- System.out.println("" + entity.getStudentID() + entity.getStudentName());
-
- List<StudentEntity> studentList = studentMapper.getStudentAll();
- for( StudentEntity entityTemp : studentList){
- System.out.println(entityTemp.getStudentName());
- }
-
- }
- }
一、MyBatis简介与配置MyBatis+Spring+MySql
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原文地址:http://www.cnblogs.com/zzyrunning/p/Study_Mybatis_frist.html